Document and Entity Information
3 Months Ended
Jun. 29, 2014
Aug. 01, 2014
Document And Entity Information    
Entity Registrant Name Ultralife Corporation  
Entity Central Index Key 0000875657  
Document Type 10-Q  
Document Period End Date Jun. 29, 2014  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Is Entity a Well-known Seasoned Issuer? No  
Is Entity a Voluntary Filer? No  
Is Entity's Reporting Status Current? No  
Entity Filer Category Smaller Reporting Company  
Entity Common Stock, Shares Outstanding   17,540,382
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2014